Irieonline...it's a old video from when it was Pirate's Cave.
It's now called Pushcart restaurant (over 5 years now at least) and they don't allow jumping and have blocked the stairs that go to the cave.
You can only access the cave from swimming over from the Rockhouse or from one of the catamarans that stop there...there's no place to access land other than Rockhouse.